I read the article but a few things didn't make sense. Know you are busy and didn't want to waste your bandwidth till I had dug more deeply. Towit: FG-servo is still phase locked, just not xtal source.
well the Sony PS-LX22 is now mine for the princely sum of £5.50. It's an FG servo like my kenwood, so a good candidate for testing a quartz upgrade. Will report back. Not expecting huge things from the TT itself as its quite lightweight at 4Kg, but that can all be fixed!
At 4Kg the chassis must be light. You can replace that with wood/ply/mdf plinth. Change the thrust pad with delrin or nylon. Change Steel ball bearing (if it has one). In the past I have seen mods of Garrard 401 platter where two rubber band were tied on the platter from outside (which dampened the resonance) Wonder if it can be done to Sony Platter.
Lure of vinyls and turntable is never ending. Some members here (India) have Linn/Garrard/TD124/SP10/Lencos in various combinations. 🙂
Regards
Lure of vinyls and turntable is never ending. Some members here (India) have Linn/Garrard/TD124/SP10/Lencos in various combinations. 🙂
Regards
I'm more interested in adding other platters. A lenco heavy is £15, a 2 part thorens is £50 and linn outer platters are only £185. Many ways to add inertia
Of course I still need to understand how much inertia is needed. That needs a testbed.
Of course I still need to understand how much inertia is needed. That needs a testbed.
Platter is the original sl 5300.
The plinth is made from 2 butchers blocks I recycled then machined with my router..
The arm tube use on the sl210 arm is from a vestax but had the same profile and lengh .
The counter weights not technics,but it all works well
I will try it out with a better cartridge soon.
The plinth is made from 2 butchers blocks I recycled then machined with my router..
The arm tube use on the sl210 arm is from a vestax but had the same profile and lengh .
The counter weights not technics,but it all works well
I will try it out with a better cartridge soon.
Ah, never seen a 5300 in the flesh but it looked different from all the other SL platters I had seen.
finally got my £5 sony and ripped into it. Plastic and nasty. The motor is not as I had hoped one of their open reel capstain motors but seems to be from a disk drive and is a 2 phase 4 coil job. A pancake motor basically. Would be ideal if anyone wanted to make a DD conversion on a rega planar turntable for a giggle.
Bill,
Sorry to hear Sony didn't turned out to be good. Few pointers on how to recognize good direct drive would be helpful. My rough guide to it is platter should be heavy. May be experienced members would chip in.
Regards.
Sorry to hear Sony didn't turned out to be good. Few pointers on how to recognize good direct drive would be helpful. My rough guide to it is platter should be heavy. May be experienced members would chip in.
Regards.
Hi,
with increasing precision of servo controls, beginning with E-servoes (back electromotive) over F-servoes (Frequency Generator) to PLLs, the platter weight was reduced, because at the same more and more manufacturers changed from slotted motors to slotless motors, which promised smoother run at the cost of lower torque and a lower building height.
Parallel to this development more parts of the plinth were pressed from plastics.
If You see a total turntable weight of less tan 5kg don't expect the platter to weigh more than 1kg without its rubber mat.
The Dual CS620Q/630Q were prime examples, where the rubber mat weighed more than double of the platter, and both together just slightly more than 1kg.
Still though the slotless PLL-controlled EDS910 motor allowed for very smooth and precise turning.
A lighter platter is no indicator for a lower turning precision or more uneven run.
Its rather a optical and haptical issue than a technical.
If You're not sure, try to find a service manual which will tell You what kind of motor and ontrol Your player utilizes.
Maybe it even tells You the platter mass.
jauu
Calvin
with increasing precision of servo controls, beginning with E-servoes (back electromotive) over F-servoes (Frequency Generator) to PLLs, the platter weight was reduced, because at the same more and more manufacturers changed from slotted motors to slotless motors, which promised smoother run at the cost of lower torque and a lower building height.
Parallel to this development more parts of the plinth were pressed from plastics.
If You see a total turntable weight of less tan 5kg don't expect the platter to weigh more than 1kg without its rubber mat.
The Dual CS620Q/630Q were prime examples, where the rubber mat weighed more than double of the platter, and both together just slightly more than 1kg.
Still though the slotless PLL-controlled EDS910 motor allowed for very smooth and precise turning.
A lighter platter is no indicator for a lower turning precision or more uneven run.
Its rather a optical and haptical issue than a technical.
If You're not sure, try to find a service manual which will tell You what kind of motor and ontrol Your player utilizes.
Maybe it even tells You the platter mass.
jauu
Calvin
The Sony is not a write off as its compact (shallow) so may be of use in certain configurations. My problem is that it would need a different drive system to the one I am planning. The injection moulded plastic plinth is however for recyling!
Thanks Calvin,
That's what I was looking for. So PLL based, slotless and quartz controller are comparatively good. Provided well made. Heavy platter would have high inertia and absorb noise which is also good. I have Sansui Direct drive motor which has light platter. Don't know the model name but some thing like PD. and google says it has frequency generator. Will post pictures. I don't have any plan to built new turntable from it but I wonder if It can take little heavy platter ?
Regards
That's what I was looking for. So PLL based, slotless and quartz controller are comparatively good. Provided well made. Heavy platter would have high inertia and absorb noise which is also good. I have Sansui Direct drive motor which has light platter. Don't know the model name but some thing like PD. and google says it has frequency generator. Will post pictures. I don't have any plan to built new turntable from it but I wonder if It can take little heavy platter ?
Ahh OK. Didn't knew you were going to make controller for it. That would be interesting too.
Regards
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Yes, been looking at this DRV8308EVM Evaluation Module for Three-phase Brushless Motor Pre-driver - DRV8308EVM - TI Tool Folder assuming I get blag one off TI. should drive any 3 phase brushless motor (so anything technics did). Whilst it is unlikely to be significantly better than that quartz servo setups it can be retrofitted (say my kenwood) and can be easily adjusted by hooking a PC up. so adding 78 operation would be easy and adjusting for platter changes etc can be done.
Might be a dead end, but might give a new lease of life to some DD turntables. Don't know unless we try.
Might be a dead end, but might give a new lease of life to some DD turntables. Don't know unless we try.
Hope no one laughs, but a thought just came to my mind regarding light platter. How about having a light sub platter below large platter, which will have a belt which will drive a centrifugal governor (or a small flywheel). This would be passive attachment i.e. while direct drive motor turns the platter the belt and governor will somewhat give more stability to the speed.
If you can think of it, it has probably been done. But once you have a feedback loop around the motor do you need to? Nothing stopping you. Likewise upsetting the rim drive crowd by grafting a DD motor onto an old garrard or thorens is possible and tempting.
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